CN113991705B - Wind power grid-connected system frequency modulation control method with energy storage wind power plant participating in primary frequency modulation control - Google Patents
Wind power grid-connected system frequency modulation control method with energy storage wind power plant participating in primary frequency modulation control Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a wind power grid-connected system frequency modulation control method for participating in primary frequency modulation control of an energy storage wind power plant, belonging to the technical field of oscillation suppression of a new energy access grid system, comprising the following steps: acquiring an active power reference value of the fan after primary frequency modulation control based on a pre-established fan frequency modulation control model; calculating to obtain the fan frequency modulation output increment based on the active power reference value of the fan after primary frequency modulation control; in response to detecting that the actual frequency deviation of the power grid of the wind power grid-connected system exceeds a preset frequency threshold, calculating to obtain the frequency modulation output of the energy storage system based on the frequency modulation output increment of the fan, and realizing frequency modulation control through the frequency modulation output increment of the energy storage system; the self frequency modulation capacity of the wind turbine and the frequency modulation capacity of the energy storage system are reasonably and effectively utilized, the stability of the wind power grid-connected system is improved, and the wind power absorption capacity is improved.
Description
Technical Field
The invention relates to a wind power grid-connected system frequency modulation control method for participating in primary frequency modulation control of an energy storage wind power plant, and belongs to the technical field of oscillation suppression of a new energy access power grid system.
Background
With the great reduction of fossil resources such as coal, petroleum and the like, new energy resources represented by wind power are rapidly developed, but the intermittence and fluctuation of output power of the new energy resources seriously influence the stability of the frequency of a power system; at present, most fans are not provided with a speed regulator, and the rotating speed of the fans is decoupled from the system frequency, so that when the system frequency changes, the fans cannot change the output of a prime motor to participate in the system frequency adjustment like a conventional unit, and cannot temporarily restrain the system frequency change by changing the rotating kinetic energy of the fans, which can definitely influence the system frequency safety; this situation is more serious as the permeability of wind power increases.
The battery energy storage system (Battery Energy Storage Systems, BESS) has the advantages of high response speed, strong short-time power throughput capacity and bidirectional regulation and accurate tracking capacity, so that research of using energy storage to participate in frequency modulation is also paid attention under the condition that the new energy power generation permeability is continuously increased; however, in the existing primary frequency modulation method of the wind power plant grid-connected system, when the wind power plant does not have frequency modulation capability, the energy storage capacity configuration is higher only by the participation of the energy storage self in frequency adjustment; when the fan has frequency modulation capability, the research is mainly focused on improving the secondary frequency drop of the fan after frequency modulation recovery by using an energy storage system, and the energy storage and the rotor kinetic energy coordination of the wind turbine are not considered to provide frequency support, so that the technical economy of frequency adjustment is reduced.
Disclosure of Invention
The invention aims to provide a frequency modulation control method for a wind power grid-connected system with an energy storage wind power plant participating in primary frequency modulation control, which reasonably and effectively utilizes the self frequency modulation capacity of a fan and the frequency modulation capacity of the energy storage system, improves the stability of the wind power grid-connected system and improves the wind power absorption capacity.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
The invention provides a wind power grid-connected system frequency modulation control method for participating in primary frequency modulation control of an energy storage wind power plant, which comprises the following steps:
Acquiring an active power reference value of the fan after primary frequency modulation control based on a pre-established fan frequency modulation control model;
calculating to obtain the fan frequency modulation output increment based on the active power reference value of the fan after primary frequency modulation control;
And in response to detecting that the actual frequency deviation of the power grid of the wind power grid-connected system exceeds a preset frequency threshold, calculating to obtain the frequency modulation output of the energy storage system based on the frequency modulation output increment of the fan, and realizing frequency modulation control through the frequency modulation output increment of the energy storage system.
Further, the fan frequency modulation control model is as follows:
Wherein P * s_ref is an active power reference value of the fan after primary frequency modulation control, P del is an active power reference value of the fan after overspeed load shedding control, deltaP 1 is an active increment of the fan after virtual inertia control, deltaP 2 is an active increment of the fan after droop control, K d is a virtual inertia coefficient of the fan, K p is a droop coefficient of the fan, and Deltaf is an actual frequency deviation of a power grid of the wind power grid-connected system.
Further, the fan frequency modulation output increment is calculated by the following method:
Wherein, P * s_ref is the active power reference value of the fan after primary frequency modulation control, P del is the active power reference value of the fan after overspeed load shedding control, P s is the active power actual measurement value of the fan, K d is the virtual inertia coefficient of the fan, K p is the sagging coefficient of the fan, and Δf is the actual frequency deviation of the power grid of the wind power grid-connected system.
Further, the energy storage system frequency modulation output is calculated by the following method:
Wherein K bess is a sagging coefficient of energy storage power calculation in the energy storage system, deltaP f is a fan frequency modulation output increment, P del is an active power reference value of the fan after overspeed load shedding control, P s is an active power actual measurement value of the fan, K d is a fan virtual inertia coefficient, K p is a fan sagging coefficient, deltaf is a grid actual frequency deviation of the wind power grid-connected system.
Further, the actual frequency deviation of the power grid of the wind power grid-connected system is the frequency deviation between the actual measured frequency and the reference frequency of the power grid.
Further, the method also comprises the frequency response step of the energy storage system:
And inputting the frequency modulation output of the energy storage system into a frequency modulation control model of the energy storage system to obtain a current value and a voltage value output by the energy storage system, thereby realizing the frequency response of the energy storage system.
Compared with the prior art, the invention has the following beneficial effects:
According to the wind power grid-connected system frequency modulation control method with the energy storage wind power plant participating in primary frequency modulation control, an active power reference value of a fan after primary frequency modulation control is obtained based on a pre-established fan frequency modulation control model, an active power reference value of the fan after primary frequency modulation control is calculated to obtain a fan frequency modulation output increment, overspeed load shedding control is added in the control process of the fan, and the fan and a conventional unit coordinate to perform primary frequency modulation of the wind power grid-connected system; based on the fan frequency modulation output increment, calculating to obtain the frequency modulation output of the energy storage system, so as to adjust the output power of the energy storage system, and the energy storage system participates in primary frequency modulation; in summary, the wind power grid-connected system frequency modulation control method with the energy storage wind power plant participating in primary frequency modulation control provided by the invention reasonably and effectively utilizes the self frequency modulation capacity of the fan and the frequency modulation capacity of the energy storage system, improves the stability of the wind power grid-connected system and improves the wind power absorption capacity.
Drawings
FIG. 1 is a frequency modulation control block diagram of a fan provided by an embodiment of the invention;
FIG. 2 is a control block diagram of an energy storage system provided by an embodiment of the present invention;
FIG. 3 is a block diagram of a wind-storage coordination FM control provided by an embodiment of the present invention;
fig. 4 is a flowchart of a frequency modulation control method of a wind power grid-connected system with an energy storage wind power plant participating in primary frequency modulation control according to an embodiment of the invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and the following examples are only for more clearly illustrating the technical aspects of the present invention, and are not to be construed as limiting the scope of the present invention.
Example 1
The embodiment of the invention provides a frequency modulation control method of a wind power grid-connected system with energy storage for participating in primary frequency modulation control, which comprises the following steps:
S1, acquiring an active power reference value of the fan after primary frequency modulation control based on a pre-established fan frequency modulation control model.
In order to jointly realize primary frequency modulation of a wind power grid-connected system by a fan and a conventional unit, a fan frequency modulation control model is pre-established, and overspeed load shedding control, virtual inertia control and sagging control are added into the fan frequency modulation control model, wherein the specific expression is as follows:
Wherein P * s_ref is an active power reference value (MW) of the fan after primary frequency modulation control, P del is an active power reference value (MW) of the fan after overspeed load shedding control, deltaP 1 is an active increment (MW) of the fan after virtual inertia control, deltaP 2 is an active increment (MW) of the fan after droop control, K d is a virtual inertia coefficient of the fan, K p is a droop coefficient of the fan, deltaf is an actual frequency deviation (Hz) of a power grid of a wind power grid-connected system, and the actual frequency deviation of the power grid of the wind power grid-connected system is a frequency deviation between an actual measured frequency f sys and a reference frequency f N of the power grid.
The virtual inertia coefficient of the fan and the sagging coefficient of the fan are set as constants, and DeltaP 1、ΔP2 is also a reference value for regulating the output active power of the induction generator, which is obtained through inertia control and sagging control calculation respectively.
S2, calculating to obtain the fan frequency modulation output increment based on the active power reference value of the fan after primary frequency modulation control.
When the wind power grid-connected system has frequency disturbance, the increment of the power reference value of the fan after frequency modulation control is as follows:
Wherein P * s_ref is an active power reference value (MW) of the wind turbine after primary frequency modulation control, P del is an active power reference value (MW) of the wind turbine after overspeed load shedding control, P s is an active power actual measurement value (MW) of the wind turbine, K d is a virtual inertia coefficient of the wind turbine, K p is a sagging coefficient of the wind turbine, Δf is an actual frequency deviation (Hz) of a power grid of a wind power grid-connected system, the actual frequency deviation of the power grid of the wind power grid-connected system is a frequency deviation between an actual frequency f sys of the power grid and a reference frequency f N, and the increment of the power reference value of the wind turbine after frequency modulation control is a frequency modulation output increment of the wind turbine.
And S3, responding to the fact that the actual frequency deviation of the power grid of the wind power grid-connected system exceeds a preset frequency threshold, calculating to obtain the frequency modulation output of the energy storage system based on the frequency modulation output increment of the fan, and realizing frequency modulation control through the frequency modulation output increment of the energy storage system.
When detecting that the actual frequency deviation of the power grid of the wind power grid-connected system exceeds a preset frequency threshold f d, adding self-output of the energy storage system to participate in frequency adjustment, and calculating to obtain the frequency-modulated output of the energy storage system based on the frequency-modulated output increment of the fan:
Wherein K bess is a sagging coefficient of energy storage power calculation in the energy storage system, deltaP f is a fan frequency modulation output increment, K d is a fan virtual inertia coefficient, K p is a fan sagging coefficient, deltaf is an actual frequency deviation of a power grid of the wind power grid-connected system, and P * ref in the above formula is an output power reference value (MW) of the energy storage system.
In order to further optimize the frequency response of the wind power grid-connected system, an energy storage system (centralized) is configured at an outlet bus of the wind power plant to participate in primary frequency modulation, and an energy storage system control model is determined.
The energy storage system control model takes the output power reference value of the energy storage system as input, and the exchange energy between the energy storage system and the bus is controlled through the bidirectional DC/AC converter, so that the frequency response of the energy storage system is realized, and the wind power plant system added with the energy storage system has better frequency response and adjustment capability.
The specific expression of the energy storage system control model is as follows:
Wherein, K bp1、Kbi1、Kbp2、Kbi2、Kbp3、Kbi3、Kbp4 and K bi4 are respectively the controller parameters of the energy storage system PI 1、PI2、PI3、PI4, i bd、ibq、i* bq、i* bd is respectively the d-axis component and q-axis component of the actual value and the reference value of the current injected by the energy storage system to the wind power plant bus, u bd、ubq is respectively the d-axis component and q-axis component of the output voltage of the alternating current side of the energy storage system converter, u bsd、ubsq is respectively the d-axis component and q-axis component of the front feed network voltage of the energy storage system, X BL is the inductance of the energy storage system converter side, and P b、Qb、P* ref、Q* ref is respectively the actual value and the reference value of the active power and the reactive power of the current injected by the energy storage system to the bus.
Example two
As shown in fig. 1 to 3, the embodiment of the invention provides a frequency modulation control method of a wind power grid-connected system with an energy storage wind power plant participating in primary frequency modulation control.
As shown in FIG. 1, in order to jointly realize primary frequency modulation of a wind power grid-connected system by a fan and a conventional unit, a fan frequency modulation control model is pre-established, and overspeed load shedding control, virtual inertia control and sagging control are added into the fan frequency modulation control model so that the fan has inertia supporting and frequency modulation performance similar to those of the conventional unit; in the figure, v w is wind speed, and d is load shedding ratio.
The specific expression of the fan frequency modulation control model is as follows:
Wherein P * s_ref is an active power reference value (MW) of the fan after primary frequency modulation control, P del is an active power reference value (MW) of the fan after overspeed load shedding control, K d is a virtual inertia coefficient of the fan, K p is a sagging coefficient of the fan, Δf is an actual frequency deviation (Hz) of a power grid of a wind power grid-connected system, and the actual frequency deviation of the power grid of the wind power grid-connected system is a frequency deviation between an actual measured frequency f sys of the power grid and a reference frequency f N.
The virtual inertia coefficient of the fan and the sagging coefficient of the fan are set as constants, and DeltaP 1、ΔP2 is also a reference value for regulating the output active power of the induction generator, which is obtained through inertia control and sagging control calculation respectively.
As shown in fig. 3, determining an output power reference value (MW) of the energy storage system by combining the current output of the fan and the actual frequency deviation of the power grid of the wind power grid-connected system, so as to realize wind-storage coordination frequency modulation control; in the figure, RSC is a rotor-side converter (Rotor Side Converter), GSC is a grid-side converter (Grid Side Converter), crowbar is a rotor-side protection circuit, DFIG is a doubly-fed wind turbine generator, PWM is pulse width modulation (Pulse width modulation), SVPWM is space vector pulse width modulation (Space Vector Pulse Width Modulation), P b、Qb is the active power and the reactive power of an energy storage system injected into a bus bar, and P g、Qg is the active power and the reactive power sent out from the bus bar.
Acquiring the actual frequency deviation of the current power grid of the wind power grid-connected system, when the actual frequency deviation of the power grid of the wind power grid-connected system is greater than or equal to a preset frequency threshold f d, placing a switch at a position 1, responding to the change of the frequency modulation output increment of the fan by an output power reference value of the energy storage system, wherein K bess is a proportionality coefficient thereof, and K bess is a sagging coefficient of energy storage power calculation; when the actual frequency deviation of the power grid of the wind power grid-connected system is smaller than a preset frequency threshold f d, the switch is arranged at the position 2, the output power reference value of the energy storage system is 0, the energy storage system does not participate in frequency adjustment of the system, and the frequency modulation power is completely borne by the fan.
Calculating the frequency modulation output increment of the fan, and when the system has frequency disturbance, the increment of the power reference value of the fan after frequency modulation control is as follows:
Wherein P * s_ref is an active power reference value (MW) of the wind turbine after primary frequency modulation control, P del is an active power reference value (MW) of the wind turbine after overspeed load shedding control, P s is an active power actual measurement value (MW) of the wind turbine, K d is a virtual inertia coefficient of the wind turbine, K p is a sagging coefficient of the wind turbine, Δf is an actual frequency deviation (Hz) of a power grid of a wind power grid-connected system, the actual frequency deviation of the power grid of the wind power grid-connected system is a frequency deviation between an actual frequency f sys of the power grid and a reference frequency f N, and the increment of the power reference value of the wind turbine after frequency modulation control is a frequency modulation output increment of the wind turbine.
When detecting that the actual frequency deviation of the power grid of the wind power grid-connected system exceeds a preset frequency threshold f d, adding self-output of the energy storage system to participate in frequency adjustment, and calculating to obtain the frequency-modulated output of the energy storage system based on the frequency-modulated output increment of the fan:
Wherein K bess is a sagging coefficient of energy storage power calculation in the energy storage system, deltaP f is a fan frequency modulation output increment, K d is a fan virtual inertia coefficient, K p is a fan sagging coefficient, deltaf is an actual frequency deviation of a power grid of the wind power grid-connected system, and P * ref in the above formula is an output power reference value (MW) of the energy storage system.
As shown in fig. 2, in order to further optimize the frequency response of the wind power grid-connected system, an energy storage system (centralized) is configured at an outlet bus of the wind power plant to participate in primary frequency modulation, and an energy storage system control model is determined; in the figure, SVPWM is space vector pulse width modulation (Space Vector Pulse Width Modulation), and AC/DC stands for bidirectional AC/DC converter.
The energy storage system control model takes the output power reference value of the energy storage system as input, and the exchange energy between the energy storage system and the bus is controlled through the bidirectional AC/DC converter, so that the frequency response of the energy storage system is realized, and the wind power plant system added with the energy storage system has better frequency response and adjustment capability.
The specific expression of the energy storage system control model is as follows:
Wherein, K bp1、Kbi1、Kbp2、Kbi2、Kbp3、Kbi3、Kbp4 and K bi4 are respectively the controller parameters of the energy storage system PI 1、PI2、PI3、PI4, i bd、ibq、i* bq、i* bd is respectively the d-axis component and q-axis component of the actual value and the reference value of the current injected by the energy storage system to the wind power plant bus, u bd、ubq is respectively the d-axis component and q-axis component of the output voltage of the alternating current side of the energy storage system converter, u bsd、ubsq is respectively the d-axis component and q-axis component of the front feed network voltage of the energy storage system, X BL is the inductance of the energy storage system converter side, and P b、Qb、P* ref、Q* ref is respectively the actual value and the reference value of the active power and the reactive power of the current injected by the energy storage system to the bus.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (3)
1. A wind power grid-connected system frequency modulation control method with energy storage wind power stations participating in primary frequency modulation control is characterized by comprising the following steps:
Acquiring an active power reference value of the fan after primary frequency modulation control based on a pre-established fan frequency modulation control model;
calculating to obtain the fan frequency modulation output increment based on the active power reference value of the fan after primary frequency modulation control;
In response to detecting that the actual frequency deviation of the power grid of the wind power grid-connected system exceeds a preset frequency threshold, calculating to obtain the frequency modulation output of the energy storage system based on the frequency modulation output increment of the fan, and realizing frequency modulation control through the frequency modulation output increment of the energy storage system;
The fan frequency modulation control model is as follows:
Wherein P * s_re f is an active power reference value of the fan after primary frequency modulation control, P del is an active power reference value of the fan after overspeed load shedding control, deltaP 1 is an active increment of the fan after virtual inertia control, deltaP 2 is an active increment of the fan after sagging control, K d is a virtual inertia coefficient of the fan, K p is a sagging coefficient of the fan, and Deltaf is an actual frequency deviation of a power grid of the wind power grid-connected system;
The fan frequency modulation output increment is calculated by the following method:
Wherein, P * s_ref is the active power reference value of the fan after primary frequency modulation control, P del is the active power reference value of the fan after overspeed load shedding control, P s is the active power actual measurement value of the fan, K d is the virtual inertia coefficient of the fan, K p is the sagging coefficient of the fan, and Δf is the actual frequency deviation of the power grid of the wind power grid-connected system;
the frequency modulation output of the energy storage system is calculated by the following method:
Wherein K bess is a sagging coefficient of energy storage power calculation in the energy storage system, deltaP f is a fan frequency modulation output increment, P del is an active power reference value of the fan after overspeed load shedding control, P s is an active power actual measurement value of the fan, K d is a fan virtual inertia coefficient, K p is a fan sagging coefficient, deltaf is a grid actual frequency deviation of the wind power grid-connected system.
2. The wind power grid-connected system frequency modulation control method with the energy storage wind power plant participating in primary frequency modulation control according to claim 1, wherein the actual frequency deviation of the power grid of the wind power grid-connected system is the frequency deviation between the actual frequency of the power grid and the reference frequency.
3. The method for controlling frequency modulation of a wind power grid-connected system with energy storage wind power plant participating in primary frequency modulation control according to claim 1, further comprising the step of frequency response of the energy storage system:
And inputting the frequency modulation output of the energy storage system into a frequency modulation control model of the energy storage system to obtain a current value and a voltage value output by the energy storage system, thereby realizing the frequency response of the energy storage system.
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